DigiSpark clone 8x WS2812 rainbow wheel with ambient light LED brightness adjustment

Bill Of Materials:

• 1x Digispark mounting an Attiny85
• 1x 8xWS2812 rigid led bar
• 1x LDR ("5528" used in the project)
• 1x 10KΩ resistor

Wiring Diagram

Tested Working Development Environment:

• IDE : PlatformIO (v2.1.0, on Visual Studio Code v1.35.0)
• OS: MacOS 10.13.6 (Hig Sierra)

Libraries/Dependencies:

• RunningMedian
• Adafruit NeoPixel

Nice To Know:

• To upload the code, make sure to have an USB cable with every pin wired: cheap charging cables often have just +5V and ground wired
• Uploading from PlatformIO to DigiSpark needs you to plug the DigiSpark after compiling, even though the console doesn't warn "now it's time to plug your DigiSpark", as Arduino IDE does.
• Quick fix for issue in uploading to DigiSpark from PlatformIO on MacOS: PIO issue 111
• Cheap USB chargers may provide dirty/noisy output, which could make LEDs oddly flicker expecially at low brightness: make sure to have a clean 5VDC source, or to filter adding a capacitor or a more proper circuit like this one: